While AdGaurd is active I'm not sure why Outlook is allowing a sucessful test from the Account Settings / Change Account / Test Account Settings ..., and then turns around and fails the Recieve part of the email processing from the Outlook main screen. As soon as I disable AdGuard Outlook Recieves just fine.

I'm guessing that for some reason, Adguard is set to filter the e-mail client. What's the name of running executable for Outlook? What you can try doing is going into Adguard's settings > Browsers section and clicking the Reset to default button to see if that stops Adguard from filtering Outlook.

I went to 'Browsing Security', and clicked the 'Reset Default' with same result.

Just to be sure; Adguard is running, and protection is enabled, Outlook 2013 is on the screen, I go up and tap the send/recieve icon in the top, the 'Outlook Send Recieve Progress...' window appears, and in that window I get Task 'My eMail 2 - Receiving' reported error (0x80004005) : 'The operation failed.'.

I don't touch outlook, and it is still running on the desktop. I right-click the Adguard icon in the system tray and select to disable protection. I go up and tap the send/recieve icon in the top, the 'Outlook Send Recieve Progress...' window appears, and all the email accounts process correctly.

I have disabled all the Outlook add-ins with the same result.

When I go into Task manager; the process for Outlook is: Microsoft Outlook
When I go into Task manager; the Details for Outlook is: OUTLOOK.EXE

The developers will need to investigate the incompatibility with SEP, Outlook and Adguard's WFP driver. The WFP driver has several incompatibilities, including ESET NOD32/Smart Security, Kaspersky Internet Security 2014 and now Symantec Endpoint Protection. From what I've read, Adguard 5.9 will have a new driver which *may* address these issues. Of course, the developers will need to double check.

Adguard 5.9 beta testing should start soon (they're working on the new Parental Control feature currently). If you're interested, you can apply to become a beta tester by reading the information in this topic.

I'm running Windows 10 Enterprise (Creators update and new Defender) with the Beta 6.2369.1938 version and have the same issue, running Outlook 2007 (old but good) and some(not all) of my pop3 accounts are blocked by the wfp driver. Those who are blocked use standard pop3 port tcp/110 but i also have some that works with the same port!!. T
he email domain blocked in my case is Telia.com , the working one is stackangen.se
I want to use the WFP with Edge but at the moment its not possible due to the pop-problem

Any news on correcting the WFP-driver or can you give me any filter rules that can fix this?